// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CC_INPUT_SCROLLBAR_H_
#define CC_INPUT_SCROLLBAR_H_

#include "cc/base/cc_export.h"
#include "ui/gfx/geometry/point.h"
#include "ui/gfx/geometry/rect.h"

class SkCanvas;

namespace cc {

enum ScrollbarOrientation { HORIZONTAL,
    VERTICAL };
enum ScrollDirection { SCROLL_BACKWARD,
    SCROLL_FORWARD };
// For now, TRACK includes everything but the thumb including background and
// buttons.
enum ScrollbarPart { THUMB,
    TRACK };

class Scrollbar {
public:
    virtual ~Scrollbar() { }

    virtual ScrollbarOrientation Orientation() const = 0;
    virtual bool IsLeftSideVerticalScrollbar() const = 0;
    virtual gfx::Point Location() const = 0;
    virtual bool IsOverlay() const = 0;
    virtual bool HasThumb() const = 0;
    virtual int ThumbThickness() const = 0;
    virtual int ThumbLength() const = 0;
    virtual gfx::Rect TrackRect() const = 0;
    virtual float ThumbOpacity() const = 0;
    virtual bool NeedsPaintPart(ScrollbarPart part) const = 0;
    virtual void PaintPart(SkCanvas* canvas,
        ScrollbarPart part,
        const gfx::Rect& content_rect)
        = 0;
};

} // namespace cc

#endif // CC_INPUT_SCROLLBAR_H_
